锌锰共掺杂二氧化钛的制备及其性能研究

Study on Preparation and Performance of Zinc,Manganese Titanium Dioxide

以钛酸丁酯为钛源,硫酸锌为锌源,硫酸锰为锰源,通过溶胶-凝胶法制备了纯TiO_(2)、锰单掺杂TiO_(2)和锌锰共掺杂TiO_(2)催化剂.采用XRD、SEM和UV-Vis分别表征了催化剂的物相结构、微观形貌及光吸收特性,并以亚甲基蓝溶液为目标污染物,研究了催化剂的光催化降解活性.结果表明:Zn、Mn共掺杂通过协同作用有效提高了TiO_(2)在可见光区的光催化效率.当摩尔比Zn/Ti=4.5%、Mn/Ti=14%时制备的Zn和Mn共掺杂TiO_(2)催化剂,可见光照180 min后对亚甲基蓝溶液的降解率达到75.42%,相较于纯TiO提高了20%.

Pure TiO_(2),manganese single-doped TiO_(2)and zinc-manganese co-doped TiO_(2)catalysts were prepared by sol-gel method using butyl titanate as titanium source,zinc sulfate as zinc source and manganese sulfate as manganese source. The phase structure,micromorphology,and light absorption properties of the catalysts were respectively characterized by XRD,SEM and UV-Vis. At the same time,the photocatalytic degradation activity of these catalysts was investigated by using methylene blue solution as the target pollutant. The results showed that Zn and Mn codoping effectively improved the photocatalytic efficiency of TiOin the visible light region through synergistic reaction.When the Zn and Mn codoped TiO_(2)catalysts were prepared at the molar ratio of Zn/Ti = 4.5% and Mn/Ti = 14%,the degradation rate of methylene blue solution reached 75.42% after visible light illumination of 180 min,which was 20% higher compared to pure TiO_(2).